1. Infighting amongst each other.
2. Conquest by Macedonia.
3. Takeover by Rome.
4. Takeover by the Ottoman Turks.
The successful invasion was led by Macedonia and its king Alexander the Great, with Greek allies assisting.
Agamemnon
Agamemnon.
some Greeks rebelled against he and helped there fellow Greeks in the fight for Asia
The tale of the Trojan war is most famously told in the Iliad. The Greeks were led by Menelaus and his brother Agamemnon.
The Greeks.
Leonidas I was the land commander. Themistocles led the navy
The city-states of Sparta and Athens were constantly feuding, and this occasionally led to war.
The Syrian-Greeks, led by Antiochus IV.
Invasions by the Dorian Greeks and the Sea Peoples.
Agamemnon.
Their ten generals, one from each tribe.